You got lower lows happening. The 45M sub count is what it was over two years ago.Subscriptions growth in consoles typically is linked to sales, so PS Plus has been stagnant when console sales have been stagnant due to chips shortage.
Next quarter console sales will start to skyrocket so PS Plus will go back to grow again. They make a ton of billions per year and this quarter their game sub made more money than it ever did (or any other game sub from MS and Nintendo).
So yes, Sony execs don't give a fuck about having lost temporally 2M subs because they have over 45M subs paying on average more than before and in addition to the game subs they make a shit ton of revenue and profit with other things.
Your chart shows Q1-Q3 in the past few years having increased sub count. But this year going from Q1 to Q2 it's already on the down trend losing 2M.